Changelog: V2: -fix building warnings of min(...). This is the usual physical memory layout boot printout: ... [ 0.000000] Zone ranges: [ 0.000000] DMA [mem 0x00001000-0x00ffffff] [ 0.000000] DMA32 [mem 0x01000000-0xffffffff] [ 0.000000] Normal [mem 0x100000000-0xc3fffffff] [ 0.000000] Movable zone start for each node [ 0.000000] Early memory node ranges [ 0.000000] node 0: [mem 0x00001000-0x00099fff] [ 0.000000] node 0: [mem 0x00100000-0xbf78ffff] [ 0.000000] node 0: [mem 0x100000000-0x63fffffff] [ 0.000000] node 1: [mem 0x640000000-0xc3fffffff] ... This is the log when we set "mem=2G" on the boot cmdline: ... [ 0.000000] Zone ranges: [ 0.000000] DMA [mem 0x00001000-0x00ffffff] [ 0.000000] DMA32 [mem 0x01000000-0xffffffff] // should be 0x7fffffff, right? [ 0.000000] Normal empty [ 0.000000] Movable zone start for each node [ 0.000000] Early memory node ranges [ 0.000000] node 0: [mem 0x00001000-0x00099fff] [ 0.000000] node 0: [mem 0x00100000-0x7fffffff] ... This patch fixes the printout, the following log shows the right ranges: ... [ 0.000000] Zone ranges: [ 0.000000] DMA [mem 0x00001000-0x00ffffff] [ 0.000000] DMA32 [mem 0x01000000-0x7fffffff] [ 0.000000] Normal empty [ 0.000000] Movable zone start for each node [ 0.000000] Early memory node ranges [ 0.000000] node 0: [mem 0x00001000-0x00099fff] [ 0.000000] node 0: [mem 0x00100000-0x7fffffff] ... Signed-off-by: Xishi Qiu <qiuxishi@xxxxxxxxxx> --- arch/x86/mm/init.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c index 66dba36..963945d 100644 --- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c @@ -674,10 +674,12 @@ void __init zone_sizes_init(void) memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); #ifdef CONFIG_ZONE_DMA - max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; + max_zone_pfns[ZONE_DMA] = min_t(unsigned long, + max_low_pfn, MAX_DMA_PFN); #endif #ifdef CONFIG_ZONE_DMA32 - max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; + max_zone_pfns[ZONE_DMA32] = min_t(unsigned long, + max_low_pfn, MAX_DMA32_PFN); #endif max_zone_pfns[ZONE_NORMAL] = max_low_pfn; #ifdef CONFIG_HIGHMEM -- 2.0.0 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>